Chemical Engineering Fluid Mechanics Short Questions - Set 18 - ObjectiveBooks

Chemical Engineering Fluid Mechanics Short Questions - Set 18

Practice Test: Question Set - 18


1. A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is __________ kg.
    (A) 10
    (B) 100
    (C) 1000
    (D) 10000

2. f = 16/NRe, is valid for
    (A) Turbulent flow
    (B) Laminar flow through an open channel
    (C) Steady flow
    (D) None of these

3. Power number is the ratio of
    (A) Drag stress to inertial stress
    (B) Inertial stress to drag stress
    (C) Inertial stress to gravitational stress
    (D) Gravitational stress to drag stress

4. Which law is followed by the velocity distribution in the turbulent boundary layer?
    (A) Parabolic law
    (B) Linear law
    (C) Logarithmic law
    (D) None of these

5. A centrifugal pump has the following specifications: 
    Power = 4 H.P.; Speed = 800 rpm
    Head = 8 meters
    Flow = 1000 liters/minutes.
If its speed is halved, the power consumed now will be __________ hp.
    (A) 0.5
    (B) 2
    (C) 4
    (D) 1

6. In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)
    (A) Vavg
    (B) 1.2 Vavg
    (C) 1.5 Vavg
    (D) 1.8 Vavg

7. A Newtonian fluid is that
    (A) Which follows Newton's law of motion
    (B) Which needs a minimum shear, before it starts deforming
    (C) For which shear & deformation are related as T = ยต (∂u/∂y)
    (D) None of these

8. Unsteady non-uniform flow is represented by flow through a/an
    (A) Long pipe at constant rate
    (B) Long pipe at decreasing rate
    (C) Expanding tube at increasing rate
    (D) Expanding tube at constant rate

9. Bernoulli's equation accounts for the
    (A) Various momentums
    (B) Various masses
    (C) Different forms of mechanical energy
    (D) None of these

10. Slugging occurs in a fluidized bed, if the bed is
    (A) Narrow
    (B) Deep
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

11. The line of action of the buoyant force acts through the
    (A) Centroid of the displaced volume of fluid
    (B) Centre of gravity of a submerged body
    (C) Centroid of the volume of any floating body
    (D) None of these

12. The curve of metacentre for a floating body __________ the curve of buoyancy.
    (A) Is always below
    (B) Is the evolute of
    (C) Intersects at right angle
    (D) Is tangential to

13. Pressure drop in a packed bed for laminar flow is given by the __________ equation.
    (A) Kozeny-Carman
    (B) Blake-Plummer
    (C) Leva's
    (D) Fanning friction factor

14. What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?
    (A) 0.5
    (B) 1
    (C) 1.5
    (D) 2

15. For an incompressible fluid, the bulk modulus of elasticity is
    (A) 5 kg/m3
    (B) ∞ N/m2
    (C) 1 N
    (D) 0 N/m

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